Alloul H.; Mukhamedshin I.; Dooglav A.; Dmitriev Y.; Ciomaga V.; Pinsard-Gaudart L.; Collin G.
(2012)
We report a systematic study of the c-lattice parameter in the Na xCoO 2 phases versus Na content x>0.5, in which sodium always displays ordered arrangements. This allows us to single out the first phase which exhibits an ...